Note that I am not a lawyer and not an expert in international commerce or Australian law. But from what I read, in Oz, to carry an unqualified ‘made in Australia' label and ensure compliance with the Trade Practices Act 1974, a product must be:
- Substantially transformed in the country represented;
- A minimum of 50 per cent of production costs must be incurred in the country represented
So one would conclude that at least 50% of the cost of making 'Made in Australia' GB bars happens in Oz. Now that may mean that if the bars are being stamped out in China for 2 cents each, and then sent to Oz for grinding, riveting, painting and packaging for another 2 cents, they can be labeled as 'Made in Oz.' But I do not see how that would be any cheaper or better for GB than just stamping, grinding, riveting, painting and packaging them in China like they do with their hard nosed bars. Note that if the bars were made exclusively in Oz, they could be labeled "Product of Australia" or "Australian Made".
To be imported to the US, all products must have the country of origin stamped on them or their labels. So they just have to have the word 'Australia' stamped on them if they are imported here from Oz. Seemingly they can be made in China and shipped to Oz and exported to the US with the Australia label, but not exported with the 'Made in Australia' label under Oz law (unless 50%+ of the cost is incurred in Oz).